package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.CategoryDTO;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private CategoryMapper categoryMapper;


    /**
     * 新增菜品以及对应的口味
     */
    @Transactional
    public void addDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 1.向菜品表插入一条数据
        dishMapper.insert(dish);

        // 获取insert语句生成的主键值
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if(flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            // 2.向口味表差人n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /*
     * 菜品查询
     *  */
    public PageResult dishListPageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        for (DishVO dishVO : page.getResult()) {
            // 根据菜品id查询口味数据
            List<DishFlavor> dishFlavors = dishFlavorMapper.getDishFlavorByDishId(dishVO.getId());
            dishVO.setFlavors(dishFlavors);
        }
        return new PageResult(page.getTotal(), page.getResult());
    }
    
    /*
     * 菜品批量删除
     *  */
    public void deleteDish(List<Long> ids) {
        // 判断当前菜品是否能够删除--是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish == null) {
                throw new DeletionNotAllowedException("id为 " + id + " 的菜品不存在，删除失败");
            }
            if(dish.getStatus() == StatusConstant.ENABLE) {
                // 菜品起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        // 判断当前菜品是否能够删除--是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        // 删除菜品表中的菜品数据
        dishMapper.deleteByIds(ids);
        // 删除菜品关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /*
     * 根据id查询菜品
     *  */
    public DishVO getDishWithFlavorById(Long id) {
        // 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        if(dish == null) {
            return null;
        }
        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getDishFlavorByDishId(id);
        // 将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /*
     * 根据id修改菜品
     *  */
    public void updateDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 修改菜品表基本信息
        dishMapper.updateDish(dish);

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            // 删除原有的口味数据
            dishFlavorMapper.deleteByDishId(dishDTO.getId());

            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            // 向口味表差人n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 条件查询菜品和口味
     *
     * @param dishDTO
     * @return
     */
    public List<DishVO> getDishWithFlavor(DishDTO dishDTO) {
        // 查询菜品数据
        List<Dish> dishList = dishMapper.list(dishDTO);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            // 根据菜品分类id查询分类名称
            Category category = categoryMapper.getById(d.getCategoryId());
            dishVO.setCategoryName(category.getName());

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getDishFlavorByDishId(d.getId());
            dishVO.setFlavors(flavors);

            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
